Respostas

2014-06-07T18:46:12-03:00
Olá, Lcsc!

x² + 7x + 12 = 0
a = 1
b = 7
c = 12

Δ = b² - 4.a.c
Δ= 7² - 4.1.12
Δ = 49 - 48
Δ = 1

-b +- √Δ / 2.a
-7 +- 1/2.1

x' = -7+1/2 = -6/2 = -3
x'' = -7-1/2 = -8/2 = -4
1 5 1